<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./demo17.js" type="module"></script>
    <script src="zzz.js" type="module"></script>
</head>
<body>
    <button>Click</button>
    <script type="module">
        import sub,{add,sum} from "./demo17.js"
        console.log("add(15,20) = " + add(15,20))
        console.log("sub(20,6) = " + add(20,6))
        console.log("sum(4,17) = " + sum(4,17))
    </script>
</body>
</html>